KUMEEICAL ESTIMATE. 



135 



Eecent. Fossil. 

 Nucleobranchiata. 



Firolidae 33 1 



Atlantidse 22 159 



65 160 



Pteeopoda. 



Hyaleidse 52 95 



Limacinidae 19 — 



Clionidce 14 — 



85 95 



Brachiopoda. 



Terebratulidae 67 340 



Spiriferidae — 380 



Rhynchonellidse 4 422 



Orthidae — 328 



Productidae — 146 



Craniadae 5 37 



Discinidae 10 90 



Lingulidae 16 99 



102 



1,842 



4,295 



7,419 



Gekeeal Sum:w[aey. 



Eecent. Fossil. 



Dibranchiata 204 189 



Tetrabranrhiata 6 2,193 



Prosobranchiata 8,465 5,819 



Inoperculated Pulmonifera 5,404 542 



Operculated Pulmonifera.. 931 46. 



Tectibranchiata 356 263 



Nudibranchiata 318 — 



Nucleobranchiata, 



Pteropoda 



Bracliiopoda 



Conchifera 



Eecent. 



55 



85 



102 



4,295 



Fossil, 



16* 



95 



1842 



7,419 



20,502 18,563 



